how to change port - OLD VERSION

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I'm running an old version because I need PHP 5.2 on my system. Localhost isn't working because Version 5.2-Nano uses port 80, and that conflicts with my Windows 10 installation. I tried editing httpd.conf and that seemed to help (I saw something that said "Apache" briefly), but it's still not loading localhost. I don't have the adminstration tool used with later versions. So how do I change the port number?